#include<bits/stdc++.h>
using namespace std;
int main(){
    int i,n=0,a=0,b=0,c=0,d=0;
    for(i=1000;i<=9999;i++){
        a=i/1000;
        b=i%1000/100;
        c=i%100/10;
        d=i%10;
        n=sqrt(i);
        if((a==b)&&(c==d)&&(b!=c)&&(n*n==i))
        cout<<i<<endl;
    }
    return 0;
}
/**************************************************************
	Problem: 1092
	User: lijinkai
	Language: C++
	Result: Accepted
	Time:3 ms
	Memory:2072 kb
****************************************************************/